class CircleDrawer {
    constructor() {
        this.canvas = document.getElementById('circleCanvas');
        this.ctx = this.canvas.getContext('2d');
        this.centerX = this.canvas.width / 2;
        this.centerY = this.canvas.height / 2;
        
        // 圆形属性
        this.radius = 100;
        this.color = '#ff0000';
        this.strokeEnabled = true;
        this.strokeWidth = 2;
        this.strokeColor = '#333333';
        
        this.init();
